Tire balancing machine



Dec. 9, 194.1. A. DE GHE'ITO TIRE BALANCING mourns 7 Filed Jui 7, 193 82 Sheets-shat 1 gwm Anselm De hetto Dec. 9, 1941, A. DE GHETTO TIREBALANGINGMA CHINE Filed July 7, 1938 2 Sheets-Sheet 2 flnselm De Gheitomining if' tire casings Patented Dec.,9, 1941 National Rubber MachineryOhio, a corporation of Ohio Company, Akron,

. Application July 7, 1938, Serial No. 217,915

6 Claims. (or. 73-53) I This invention relates to apparatus for deterorlike articles are evenly balanced,

An'obiect of the invention is to provide a simple, efflcient,inexpensive tire balancing machine by which both the direction and theamount of off balance may readily be determined.

Another object of the invention is to provide a the balancing machine ofthe type having a center balancing point with means for preventingdamage to the center point in handling the machine to place or remove atire.

These and other objects will be manifest from the following briefdescription and the accom- 1 8M 8 drawings- Of the accompanyingdrawings:

Figure 1 is a top plan view, partly broken away, of apparatus embodyingthe invention. I

Figure 2 is an elevational view thereof.

Figure 3 is a cross-section taken on line 3-3 of Figure 2.

Figure 4 is a cross-section taken on line 4-4 ofFigure 2.

Figure 5' is a fragmentary cross-section taken online 5! of Figure 1.

Referring to the drawings, a base plate III may support a loading platell upon a plurality of rods i2, i2, the base plate II preferably beingvarying load conditions of plate II. Cooperating with the end ofindicator 22 may be'a dial 22, suitably marked to show both the amountand the direction in which a tire is of! balance, (see Figures 2 and 4),which dial may be supported by a plate 25 mounted on brackets 26, 26 onthe rods l2. g.

Since the balancing pin 20 must necessarily be constructed with a verydelicate point for extreme accuracy, it might become damaged or brokenif subjected to abnormal stresses applied in adjusting a tire casing on'the machine-for testing, or in removing the tire afterv a test. Toobviate this a plurality of rollers 21, 21, carried by brackets 28, 28on balancing plate I, are so arranged that on rotation of plate I in aclockwise direction they will ride out of free-hanging position relativeto a series of cut-out portions 22, 33 in plate II, and onto the loadingplate H, whereby slightly to raise or relieve pressure on the point ofthe balan ing pin 22 which normally engages with shaft I (see Figures 2and 5).

' Lugs 29, 29 may be provided on loading plate II to limit rotationalmovement of plate l5 relative to the cut-out portions 22, in .the plate'Ii';

Downwardly extending arms 20, 20 secured to supported on threeadjustable leveling screws l2, l2. Suitably spaced above loading platell, adiustably supported on a center shaft or socket l2 mounted on platei I, is a balancing plate II having a tire centering ring mountedthereon, as by means of bolts l1, I!

passed through holes l1, l1 in plate It. Centering rings I6 of varyingdiameters, adapted to accommodate tire casings of different beaddiameters may be provided, each ring being con-v structed and arrangedto be secured by thev same bolts I1 through the holes l1.

Center shaft I may be screwed into loading plate Ii and locked flrmlyinadjusted position by means of nuts l2, l2 on opposite sides of theplate. The top of shaft II is provided with a recess I! for receivingthe point of a balancing pin 22, of known construction, secured at theunderside of balancing plate IS.

Depending in balanced relation from balancing plate l8, through suitablefree openings H in plate Ii, may be a plurality of rods 2|,-2| to thebottom ends of which is secured a plate 22 havingcentrally thereof adownwardly extending pointer or indicator 22-. The indicator'22preferably is provided with an adjustable weight 22- thereon to aid inplumbing the apparatus under.

It removably the brackets 28, 28' are provided with inwardly extendingflanges 2|, ii for engaging wedge shaped projections 32, 32 on theunderside of plate I I. By turning plate IS in clockwise direction,from'the chain-dotted line position'to the full line position shown inFigures 1 and 2. the flanges 2| become wedged on the underside ofprojections 32 against the opposing force of the rollers 2-1, as thelatter roll onto the upper surfaceof plate ,this wedging action therebyreleasably holding the balancing plate in'stable inoperative positionwith the rollers 21 against the lugs 22, vas best shown in Figures 2 and5.

In this last-named position, the rollers 21 firmly supportthe balancingplate I! so that pressure between the end of pin 20 and the supportingshaft i4 therefor will be obviated 0r relieved.

- The recessed or cut-away portions 22 are pro-' vided in plate I i toallowclearance for the rollers 21 in the tire testing positions thereof,as shown.

in chain-dotted lines in Figure 3.

In operation of the apparatus for testing a tire, the balancing plate Itmay first be set inthe position best shown in chaindotted lines in F18-llres l, 2 and 3, with the rollers 21 over the cutout portions 22 inplate II, to permit adjusting the screws i2 with the floor to set thepointer 22 on theexact center-0! dial 24. When 22 is properlycenter'edplate II is then rotated to the full line position shown in Figure 2,for lifting the balancing pin 20 out of load engagement with shaft orsocket l4. While the load is thus transferred from shaft II to plate ll,through rollers 21, the operator is free to place a finished tire onplate I5, as shown in chaindotted lines in Figure 2, without fear ofdamaging the delicate point of pin 20. Once the tire is in place theplate l may be rotated counter-clockwise until rollers 21 are over therecesses 33. In the latter position, when the apparatus is inequilibrium, pointer 23 will indicate on the dial 24 the exact amountand direction in which the tire is off balance, if any.

Modifications of the invention may be resorted to without departing fromthe spirit of the invention or the scope of the appended claims.

What is claimed is:

l. A tire-balancing machine comprising, in

combination, a balancing member for receiving thereon a tire to bebalanced, means on said member for centering a tire thereon, a pointedbalancing-pin located centrally of'said member, a relatively fixedsupport including aportion having its upper end recessed to receive thepoint of said pin to support said member in normally balanced conditionand so as to be rotatable thereon, rollers mounted on said member todepend freely therefrom in a tire-balancing position of said member,said member being rotatable at will to carry said rollers onto portionsof said .support to relieve the load of the pin on said freely therefromin a tire-balancing position,

4. A tire-balancing machine comprising, in combination, a balancingmember for receiving thereon a tire to be balanced, means on said memberfor centering a tire thereon, a balancing-pin on the underside of saidmember centrally thereof, a relatively fixed support spaced below saidmember, means on said support for receiving said balancing-pin tosupport said member in balancing condition, an indicator, meansdepending freely from said member for holding said indicator coaxialwith said pin, a dial on said support associated with said indi cator toindicate the amount and direction of oil-balance of a tire tested onsaid machine, and rollers mounted on said member to depend freely intire-balancing position thereof, said member being rotatable at will onsaid pin to carry said rollers onto portions of said support to relievethe load of the pin on said support and to support said member in stablecondition.

5. A tire-balancing machine comprising, in combination, a balancingmember for receiving thereon a tire to be balanced, means on said memberfor centering a tire thereon, a balancing-pin on the underside of saidmember centrally thereof, a relatively fixed support for said member,means on said support for receiving said balancing-pin to support saidmember inbalancing condition, an indicator, means depending freely fromsaid member for holding said indicator coaxial with said pin, a dial onsaid support associated with said indicator to indicate the amount anddirection of oft-balance of a tire being tested on said machine, rollersI mounted on said member to depend freely relative to said support intire-balancing position of said member, said member being rotatable atwill on said pin to carry said rollers onto porsaid member beingrotatable at will to carry said rollers onto portions of said support torelieve the load of the pin on said support, and means for limitingrotation of said member and to support said member in stable condition.

3. A tire-balancing machine comprising, in combination, a balancingmember for receiving thereon a tire "to be balanced, means on saidmember for centering a tire thereon, a pointed balancing-pin locatedcentrally on the underside of said member, a relatively fixed supportspaced below said member, said support having a recess for receiving thepoint of said pin to support said plate in normally balanced condition,rollers mounted on said member to depend freely therefrom'in thetire-balancing position thereof, said member being rotatable to carrysaid rollers onto portions of said support to relieve the load of thepin on said support, and means for releasably holding said member insaid relieved position thereof and to support said member in stablecondition.

tions of said suport to relieve the load of the pin on said support, andmeans associated with said member and said support for releasablyholding said member in the relieved position and to support said memberin stable condition.

6. A balancing machine comprising, in combination, a balancing memberfor receiving thereon an article to be balanced, means on said balancingmember for centering an article thereon, a relatively fixed supportingmember in spaced relation beneath said balancing member, balancing meansmounted between said members centrally thereof and including a pointedpin on one of the members and a socket on the other member for receivingthe point of said pin rocircumferentially spaced elements mounted onsaid balancing member to depend freely in an article-balancing positionthereof, said supporting member having portions thereon engageable bysaid elements when said balancing member is rotated on said balancingmeans from said balanced position of the balancing member, whereby saidbalancing member is lifted to relieve the load thereof on said pin andto support the balancing member in stable condition.

' ANSELM DE GHETTO.

